This requires Counter-Strike Source to be brought for your Steam account
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Install Counter-Strike Source and Source SDK Base 2007.
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In the \steamapps\common\Source SDK Base 2007 folder create a new folder called cstrike.
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Then download the GCFscape Installer and install it. I used the "GCFScape v1.8.5 Full" version.
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Open GCFscape and click on File > Open and go to steamapps/common/Counter-Strike Source/cstrike and find the cstrike_pak_dir.vpk file and then press Open.
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Now highlight all the files like this picture shows and then right click > Extract.
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Then extract those files into the steamapps\common\Source SDK Base 2007\cstrike folder by finding it and pressing OK.
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Copy the cspromod folder from steamapps\sourcemods\cspromod\models\props\cspromod into common/source sdk base 2007/cstrike/models/props.
source: https://steamcommunity.com/groups/officialcsp/discussions/0/35219681679704184/